[Xen-devel] [PATCH] VT-d: suppress individual flushes during hwdom setup

["Jan Beulich" <JBeulich@xxxxxxxx>]

There's an invocation of iommu_flush_all() immediately afterwards.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1310,8 +1310,11 @@ static void __hwdom_init intel_iommu_hwd
 
     setup_hwdom_pci_devices(d, setup_hwdom_device);
     setup_hwdom_rmrr(d);
+
     /* Make sure workarounds are applied before enabling the IOMMU(s). */
+    this_cpu(iommu_dont_flush_iotlb) = true;
     arch_iommu_hwdom_init(d);
+    this_cpu(iommu_dont_flush_iotlb) = false;
 
     if ( iommu_flush_all() )
         printk(XENLOG_WARNING VTDPREFIX



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